nudgeIdleNZBLeechers was calling fetchNextNZBSegment directly, causing concurrency trouble (e.g.: 'exceptions.ValueError: I/O operation on closed file'. Now calling it via callLater
nudgeIdleNZBLeechers was calling fetchNextNZBSegment directly,
causing concurrency trouble (e.g.:
'exceptions.ValueError: I/O operation on closed file'. Now calling it
via callLater

pjenvey/hellanzb,emikulic/hellanzb,emikulic/hellanzb,pjenvey/hellanzb